Room temperature synthesis and highly enhanced visible light photocatalytic activity of porous BiOI/BiOCl composites nanoplates microflowers

被引:360
作者
Dong, Fan [1 ]
Sun, Yanjuan [1 ]
Fu, Min [1 ]
Wu, Zhongbiao [2 ]
Lee, S. C. [3 ]
机构
[1] Chongqing Technol & Business Univ, Coll Environm & Biol Engn, Key Lab Catalysis Sci & Technol, Chongqing Educ Commiss, Chongqing 400067, Peoples R China
[2] Zhejiang Univ, Dept Environm Engn, Hangzhou 310027, Zhejiang, Peoples R China
[3] Hong Kong Polytech Univ, Res Ctr Environm Technol & Management, Dept Civil & Struct Engn, Hong Kong, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
BiOI/BiOCl composites; Visible light; Photocatalytic activity; Nitric oxide; Template free; TEMPLATE-FREE FABRICATION; HIERARCHICAL HOLLOW MICROSPHERES; BIOX X; REMOVAL; NO; TIO2; BR; CL;
D O I
10.1016/j.jhazmat.2012.03.015
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This research represents a highly enhanced visible light photocatalytic removal of 450 ppb level of nitric oxide (NO) in air by utilizing flower-like hierarchical porous BiOI/BiOCl composites synthesized by a room temperature template free method for the first time. The facile synthesis method avoids high temperature treatment, use of organic precursors and production of undesirable organic byproducts during synthesis process. The result indicated that the as-prepared BiOI/BiOCl composites samples were solid solution and were self-assembled hierarchically with single-crystal nanoplates. The aggregation of the self-assembled nanoplates resulted in the formation of 3D hierarchical porous architecture containing tri-model mesopores. The coupling to BiOI with BiOCl led to down-lowered valence band (VB) and up-lifted conduction band (CB) in contrast to BiOI, making the composites suitable for visible light excitation. The BiOI/BiOCl composites samples exhibited highly enhanced visible light photocatalytic activity for removal of NO in air due to the large surface areas and pore volume, hierarchical structure and modified band structure, exceeding that of P25, BiOI, C-doped TiO2 and Bi2WO6. This research results could provide a cost-effective approach for the synthesis of porous hierarchical materials and enhancement of photocatalyst performance for environmental and energetic applications owing to its low cost and easy scaling up. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:26 / 34
页数:9
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